This book addresses researchers and graduate students at the forefront of studyresearch on the Internet of Things (IoT) by presenting state-of-the-art research together with the current and future challenges in building new smart applications (e.g., Smart Cities, Smart Buildings, and Industrial IoT) in an efficient, scalable, and sustainable way. It covers the main pillars of the IoT world (Connectivity, Interoperability, Discoverability, and SecurityPrivacy), providing a comprehensive look at the current technologies, procedures, and architectures.